Goodwill and Identified Intangible Assets - Estimated Future Amortization Expense of Purchased Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 29, 2017	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
2017 (remaining three months)	$ 2,090
2018	8,362
2019	8,362
2020	3,998
2021	504
Total future amortization expense	23,316	$ 29,231
Cost of Sales [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2017 (remaining three months)	1,296
2018	5,180
2019	5,180
2020	950
2021	0
Total future amortization expense	12,606
Operating Expense [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2017 (remaining three months)	794
2018	3,182
2019	3,182
2020	3,048
2021	504
Total future amortization expense	$ 10,710